ElEctrical insulating
papErs
2
Contents
Weidmann KnoW-HoW
4
PressPaPer
6
grade K presspaper
7
grade 3 presspaper
8
grade 4 presspaper
9
Grade K t/U PressPaPer
10
diamond dotted PressPaPer
12
grade K t/u diamond dotted presspaper (thermopox)
13
grade 3 diamond dotted presspaper
14
PressPaPer Combined Polyester Film
15
thermofilm 18mp23
16
thermofilm 25mp23
16
thermofilm 13mp50
16
thermofilm 18mp50
17
thermofilm 25mp50
17
thermofilm 18pmp50
17
CrePe PaPer
18
crepe paper type 60/90
19
crepe paper type 60/120
20
crepe paper type 60/170
20
crepe paper type 67/100
21
crepe paper type 67/130
21
crepe paper type 80/120
22
crepe paper type 80/160
22
crepe paper type 100/150
23
crepe paper type 100/200
23
alUminiUm CrePe PaPer
24
storaGe reCommendation
26
3
Weidmann KnoW-hoW
excellence in quality and services
“made by Weidmann” means top
quality – there is no compromise on
that. Weidmann meets all inter­
national standards. Weidmann
ensures superior quality control along
the entire supply chain. Weidmann’s
range of electrical insulating papers
is your assurance for consistent, im­
peccable quality. The quality system
following iSO 9001:2000/en 29001
and a manufacturing process with
4
decisive know­how, continuously
optimized over decades, guarantee
the high quality of the products and
services which Weidmann is more
than happy to offer you at any time.
Working with this high­value insula­
tion material, you benefit from the
entire savings potential of all optimi­
zations without the risk involved in
products that have not been tested
to the highest standards.
Weidmann has been involved for
decades in the design and optimiza­
tion of insulation papers. Specializing
in insulation paper, Weidmann
offers a broad spectrum of cellu­
lose­based paper, ranging from flat
untreated paper to creped, coated,
calendered, thermally upgraded or
laminated material structures. in
addition, Weidmann slits, cuffs
and creases papers on demand.
The comprehensive knowledge
and expertise of the Weidmann
engineers supply the bushing, cable,
motor, generator and transformer
industry with accurate and reliable
information. Weidmann can pro­
vide an insulation layout that offers
reduction of clearances and elimina­
tion of critically stressed areas.
5
presspaper
multi-ply electrical insulating
presspapers
Weidmann manufactures several
grades of presspaper for a variety of
insulating applications. all are manu­
factured to international standards on
a multi­vat cylinder machine. This
method of construction builds up a
continuous web of processed fibers
in homogeneous layers to create a
pinhole­free structure.
Grade K Presspaper is made of 100%
sulphate wood pulp. it is a high­
strength paper with excellent electri­
cal properties. it is ideal for a broad
range of applications. it can be dyed
to various colors achievable with an
unbleached furnish. dyeing has no
effect on quality.
Grade 4 Presspaper is made of
100% cotton. it combines electrical
strength, mechanical toughness,
and flexibility for superior perfor­
mance under the most arduous
service conditions. This grade is one
of Weidmann’s most successful
presspapers. it has been in continu­
ous production for many decades,
and reflects a history of continuous
improvement made possible by
carefully selected raw materials
and developments in processing
techniques.
technical data
The technical data reflect typical
results of routine tests performed
in Weidmann laboratories accord­
ing to ieC Standards 60641­2 and
60243­1. These typical values do
not constitute specifications of
Weidmann products.
Grade 3 Presspaper is made from
a mixture of sulphate wood pulp and
cotton. it is a flexible paper that
conforms easily to uneven sur­
faces. Favored by coil winders, it
has excellent edge folding (cuffing)
properties. Weidmann developed
this paper jointly with transformer
manufacturers to meet their need for
insulation with an optimum combi­
nation of electrical and mechanical
strength, low permittivity, and maxi­
mum oil absorption. The furnish for
this paper is composed to minimize
drying times and maximize aging
properties.
Paper samples of Grade K Presspaper (natural buff) and Grade 3 Presspaper (blue)
6
grade K presspaper
thickness
master size
0.076 mm
3400 mm
standard widths
850 mm
0.10 mm
1135 mm
0.127 mm
1700 mm
0.15 mm
3400 mm
standard roll diameters
norm
internal
external
70, 76, 102, 120,
280, 370 mm
iec 60641-3-2, type p.4.1a
154 mm
0.20 mm
0.25 mm
0.30 mm
0.40 mm
0.50 mm
0.60 mm*
1420 mm
825 mm
0.70 mm*
1100 mm
0.80 mm*
1420 mm
0.90 mm*
1.00 mm*
*combination of presspapers laminated with a synthetic adhesive
thickness tolerance ± 10%
other thicknesses and roll dimensions available on request
Property
Unit
range of thickness
Value
apparent density
g/cm³
–
1.1
mpa
≤ 0.2 mm
94
tensile strength unfolded
machine direction
> 0.2 mm
110
53
cross machine direction
mpa
≤ 0.2 mm
> 0.2 mm
50
machine direction
%
≤ 0.2 mm
1.7
> 0.2 mm
2.4
cross machine direction
%
≤ 0.2 mm
7.5
> 0.2 mm
7.6
moisture content
%
–
<8
ash content
%
–
0.3
conductivity of aqueous extract
ms/m
–
2.0
ph of aqueous extract
–
–
7.2
electric strength in air unfolded
kV/mm
≤ 0.2 mm
10
> 0.2 mm
7
≤ 0.2 mm
70
> 0.2 mm
50
elongation unfolded
electric strength in oil
kV/mm
7
grade 3 presspaper
thickness
0.127 mm
master size
3400 mm
standard widths
850 mm
0.20 mm
1135 mm
0.25 mm
1700 mm
0.30 mm
3400 mm
standard roll diameters
norm
internal
external
70, 76, 102, 120,
280, 370 mm
iec 60641-3-2, type p.4.3
154 mm
0.40 mm
0.50 mm
0.80 mm *
1420 mm
1.00 mm *
825 mm
1100 mm
1420 mm
*combination of presspapers laminated with a synthetic adhesive
thickness tolerance ± 10%
other thicknesses and roll dimensions available on request
Property
Unit
range of thickness
Value
apparent density
g/cm³
–
1.0
tensile strength unfolded
elongation unfolded
mpa
≤ 0.2 mm
99
> 0.2 mm
91
≤ 0.2 mm
42
cross machine direction
mpa
> 0.2 mm
40
machine direction
%
≤ 0.2 mm
2.3
> 0.2 mm
2.8
cross machine direction
%
≤ 0.2 mm
6.9
> 0.2 mm
7.8
moisture content
%
–
<8
ash content
%
–
0.3
conductivity of aqueous extract
ms/m
–
3.7
ph of aqueous extract
–
–
7.2
electric strength in air unfolded
kV/mm
≤ 0.2 mm
10
> 0.2 mm
7
≤ 0.2 mm
75
> 0.2 mm
55
electric strength in oil
8
machine direction
kV/mm
grade 4 presspaper
thickness
0.127 mm
master size
3400 mm
standard widths
850 mm
0.18 mm
1135 mm
0.25 mm
1700 mm
0.30 mm
3400 mm
standard roll diameters
norm
internal
external
70, 76, 102, 120,
280, 370 mm
iec 60641-3-2, type p.4.2
154 mm
0.40 mm
0.50 mm
0.80 mm *
1420 mm
1.00 mm *
825 mm
1100 mm
1420 mm
*combination of presspapers laminated with a synthetic adhesive
thickness tolerance ± 10%
other thicknesses and roll dimensions available on request
Property
Unit
range of thickness
Value
apparent density
g/cm³
–
1.1
mpa
≤ 0.2 mm
90
tensile strength unfolded
machine direction
> 0.2 mm
89
44
cross machine direction
mpa
≤ 0.2 mm
> 0.2 mm
44
machine direction
%
≤ 0.2 mm
2.7
> 0.2 mm
3.2
cross machine direction
%
≤ 0.2 mm
8.8
> 0.2 mm
8.6
moisture content
%
–
<8
ash content
%
–
0.3
conductivity of aqueous extract
ms/m
–
4.7
ph of aqueous extract
–
–
7.8
electric strength in air unfolded
kV/mm
≤ 0.2 mm
10
> 0.2 mm
7
≤ 0.2 mm
75
> 0.2 mm
55
elongation unfolded
electric strength in oil
kV/mm
9
grade K t/u presspaper
thermally upgraded paper
Grade K Thermally Upgraded Press­
paper is made of sulphate wood pulp
and is used mainly as a layer insu­
lating paper in low voltage and high
voltage windings of oil­immersed
distribution transformers. The life­
time of the transformers is directly
related to the condition of insulation
paper of the winding. Thermally
upgraded paper is a cellulose­based
paper that has been chemically
modified to reduce the rate at which
the paper decomposes.
10
The purpose of thermally upgrad­
ing insulation paper is to neutralize
acids caused by thermal degradation
of the cellulose over the lifetime of
the transformer. Thermally upgraded
paper retains a much higher tensile
and bursting strength than untreated
papers when exposed to elevated
temperatures.
technical data
The technical data reflect typical
results of routine tests performed
inWeidmann laboratories accord­
ing to ieC Standards 60641­2,
60243­1 and internal test methods.
These typical values do not consti­
tute specifications of Weidmann
products.
grade K t/u presspaper
thickness
master size
0.076 mm
3400 mm
standard widths
standard roll diameters
850 mm
0.127 mm
1135 mm
0.18 mm
1700 mm
0.25 mm
3400 mm
internal
external
70, 76, 102, 120, 154 mm
280, 370 mm
0.38 mm
0.50 mm
thickness tolerance ± 10%
other thicknesses and roll dimensions available on request
Property
Unit
range of thickness
Value
apparent density
g/cm³
–
1.0
mpa
≤ 0.2 mm
115
> 0.2 mm
110
≤ 0.2 mm
50
> 0.2 mm
39
≤ 0.2 mm
2.0
tensile strength unfolded
machine direction
cross machine direction
elongation unfolded
machine direction
mpa
%
> 0.2 mm
2.4
%
≤ 0.2 mm
7.2
> 0.2 mm
7.5
moisture content
%
–
<8
ash content
%
–
0.3
conductivity of aqueous extract
ms/m
–
2.2
ph of aqueous extract
–
–
7.0
nitrogen content
%
–
1.8
electric strength in air unfolded
kV/mm
≤ 0.2 mm
10
> 0.2 mm
7
≤ 0.2 mm
70
> 0.2 mm
50
cross machine direction
electric strength in oil
kV/mm
11
diamond dotted presspaper
electrical insulating presspapers
with B-stage resin dots
diamond dotted Presspaper im­
proves the mechanical strength of
oil­immersed transformer windings
without reducing partial discharge
levels. Weidmann manufactures
this paper by applying discrete dots
of B­stage resin on both sides in a
diamond pattern. The size and shape
of the dots are carefully chosen to
avoid interfering with vacuum drying
and oil impregnation.
during B­stage, the resin dots are
dry and tack free, permitting stor­
age and handling similar to normal
presspaper. When the winding is
heated for drying purposes, the
adhesive dots melt and cure, thus
creating permanent bonding sites
unaffected by further heating cycles
that may occur in service. The bonding
strength is adequate to support
effective gluing in unsupported coil
design.
The pinhole­free multi­ply paper
allows single layer application in
LV foil windings. Temperature rise
time in the drying oven is important,
particularly during the final transition
to the temperature at which the resin
starts to melt. To obtain maximum
bond strength, this transition should
be completed as swiftly as possible.
The drying requirements of the trans­
former normally provide for adequate
curing of the resin. nevertheless,
Weidmann recommends careful
monitoring of oven performance.
Grade K T/U diamond dotted Presspaper (Thermopox)
12
technical data
The technical data reflect typical
results of routine tests performed
in Weidmann laboratories accord­
ing to ieC Standards 60641­2,
60243­1 and internal test methods.
These typical values do not consti­
tute specifications of Weidmann
products.
Grade 3 diamond dotted Presspaper
grade K t/u diamond dotted presspaper (thermopox)
thickness
master size
standard widths
standard roll diameters
internal
external
0.045 mm*
1565 mm
1016 mm
76 mm
270, 370 mm
0.06 mm*
1118 mm
0.076 mm
1219 mm
0.127 mm
1565 mm
0.18 mm
0.25 mm
0.38 mm
0.50 mm
thickness tolerance ± 10%
*insulation paper according to iec norm 60554-3-5, type 5a4-1
0.5 mm thickness available upon request subject to availability
other widths available by arrangement – rolls can also be supplied slit to specified widths as required
Property
Unit
range of thickness
apparent density
g/cm³
–
1.0
machine direction
mpa
≤ 0.2 mm
115
> 0.2 mm
110
cross machine direction
mpa
≤ 0.2 mm
50
> 0.2 mm
39
machine direction
%
≤ 0.2 mm
2.0
> 0.2 mm
2.4
cross machine direction
%
≤ 0.2 mm
7.2
> 0.2 mm
7.5
moisture content
%
–
<8
ash content
%
–
0.3
conductivity of aqueous extract
ms/m
–
2.2
ph of aqueous extract
–
–
7.0
nitrogen content
%
–
1.8
Bond strength
cured for 90 min at 90 °c and 14 kpa; tested at 100 °c
n/cm²
–
41
electric strength in air unfolded
kV/mm
≤ 0.2 mm
10
> 0.2 mm
7
electric strength in oil
kV/mm
≤ 0.2 mm
70
> 0.2 mm
50
tensile strength unfolded
elongation unfolded
Value
13
grade 3 diamond dotted presspaper
thickness
master size
standard widths
0.127 mm
1565 mm
1118 mm
0.20 mm
standard roll diameters
internal
external
76 mm
270, 370 mm
1565 mm
0.25 mm
0.40 mm
0.50 mm
thickness tolerance ± 10%
0.5 mm thickness available upon request subject to availability
other widths available by arrangement – rolls can also be supplied slit to specified widths as required
Property
Unit
range of thickness
Value
apparent density
g/cm³
–
1.0
machine direction
mpa
≤ 0.2 mm
99
> 0.2 mm
91
cross machine direction
mpa
≤ 0.2 mm
42
> 0.2 mm
40
machine direction
%
≤ 0.2 mm
2.3
> 0.2 mm
2.8
cross machine direction
%
≤ 0.2 mm
6.9
tensile strength unfolded
elongation unfolded
> 0.2 mm
7.8
moisture content
%
–
<8
ash content
%
–
0.3
conductivity of aqueous extract
ms/m
–
3.7
ph of aqueous extract
–
–
7.2
Bond strength
cured for 90 min at 90 °c and 14 kpa; tested at 100 °c
n/cm²
–
38
electric strength in air unfolded
kV/mm
≤ 0.2 mm
10
> 0.2 mm
7
≤ 0.2 mm
75
> 0.2 mm
55
electric strength in oil
14
kV/mm
presspaper comBined polyester Film
thermofilm flexiBle laminates
Presspaper Combined Polyester Film
is used for insulating applications
that require punching and forming
without significant loss of electrical
strength. Weidmann manufactures
these flexible laminates by bonding
electrical insulating presspaper with
high­quality polyester film using a
synthetic resin adhesive. The result­
ing product, sold as Thermofilm, has
excellent thermal stability and good
thermal overload properties.
Polyester/paper laminates are pre­
dominantly used for electric motor
slots and field coil insulation. They can
also be used in oil­immersed and dry
type transformers where the unique
properties of the material can be
used to advantage. Presspaper Com­
bined Polyester Film is available in
Grade K, Grade 3 and Grade 4.
technical data
The technical data reflect typical
results of routine tests performed
in Weidmann laboratories accord­
ing to ieC Standards 60626­2 and
60243­1. These typical values do
not constitute specifications of
Weidmann products.
thermoFilm is aVailaBle in tWo Forms:
Thermofilm mP:
Thermofilm PmP:
Polyester Film – Presspaper
Presspaper – Polyester Film – Presspaper
15
type
thickness
Presspaper
(mm)
master size
Film
(μm)
standard
width
standard roll
diameters
Composite
(mm)
18mp23
0.18
23
0.210
25mp23
0.25
23
0.28
13mp50
0.13
50
0.19
18mp50
0.18
50
0.24
25mp50
0.25
50
0.31
18pmp50
0.18
50
0.42
1135 mm
1135 mm
norm
internal
external
76 mm
280 mm
iec 60626-1, type F-pet/p-c
76 mm
280 mm
iec 60626-1, type p-c/F-pet/p-c
(± 5 mm) untrimmed
1135 mm
1135 mm
(± 5 mm) untrimmed
slit rolls are available cut from standard rolls in widths from 8 mm upwards depending on thickness
thermofilm 18mp23
Property
Unit
Value
grammage
g/m2
250
Film thickness
tensile strength unfolded
μm
23
machine direction
kn/m
189
cross machine direction
kn/m
116
kV
6
Breakdown voltage
thermofilm 25mp23
Property
Unit
Value
grammage
g/m2
330
Film thickness
tensile strength unfolded
μm
23
machine direction
kn/m
252
cross machine direction
kn/m
168
kV
6
Breakdown voltage
thermofilm 13mp50
Property
Unit
Value
grammage
g/m
190
Film thickness
μm
tensile strength unfolded
Breakdown voltage
16
2
50
machine direction
kn/m
162
cross machine direction
kn/m
105
kV
8
thermofilm 18mp50
Property
Unit
Value
grammage
g/m2
290
Film thickness
tensile strength unfolded
machine direction
cross machine direction
Breakdown voltage
μm
50
kn/m
216
kn/m
132
kV
8
thermofilm 25mp50
Property
Unit
Value
grammage
g/m2
345
Film thickness
tensile strength unfolded
machine direction
cross machine direction
Breakdown voltage
μm
50
kn/m
279
kn/m
186
kV
8
thermofilm 18pmp50
Property
Unit
grammage
g/m
Film thickness
μm
tensile strength unfolded
Breakdown voltage
2
Value
505
50
machine direction
kn/m
399
cross machine direction
kn/m
252
kV
10
17
crepe paper
high elongation insulating papers
Crepe Papers come in a variety of
qualities developed to meet the
requirements of the transformer
industry. The extensibility of Crepe
Paper facilitates wrapping irregular
contours, which can be useful for
joining and forming tapping leads.
The low dissipation factor makes it
especially suitable for high voltage
bushings and instrument transform­
ers. Other typical applications include
wire wrapping, and shielded rings
placed within end sections of power
transformer windings.
18
Weidmann manufacturers Crepe
Papers from high­quality electrical
grade kraft base papers (100% sul­
phate wood pulp) in reel widths up to
2500 mm. The elasticity and pliability
of the base paper combined with
controlled creping process parame­
ters determine the properties of the
final product. Careful final inspec­
tion ensures compliance with the
most demanding requirements.
technical data
The technical data reflect typical
results of routine tests performed
in Weidmann laboratories accord­
ing to ieC Standards 60554­2 and
60243­1. These typical values do
not constitute specifications of
Weidmann products.
type
thickness
60/90
0.30 mm
60/120
0.35 mm
master size
2500 mm
standard widths
750, 1000, 1500, 2500 mm
standard roll diameters
internal
external
70, 76 mm
550 mm
norm
iec 60554-3-3, type 3.2-90-50F
iec 60554-3-3, type 3.2-120-100F
60/170
0.47 mm
iec 60554-3-3, type 3.2-170-185F
67/100
0.41 mm
iec 60554-3-3, type 3.2-100-50m
67/130
0.41 mm
iec 60554-3-3, type 3.2-130-100F
80/120
0.38 mm
iec 60554-3-3, type 3.2-120-50F
80/160
0.47 mm
iec 60554-3-3, type 3.2-160-100F
100/150
0.46 mm
100/200
0.54 mm
1500 mm
750, 1000, 1500 mm
70, 76 mm
550 mm
iec 60554-3-3, type 3.2-150-50F
iec 60554-3-3, type 3.2-200-100c
slit coils widths: min. 20 mm, id: 50 mm, od: ~ 100 – 300 mm
crepe paper type 60/90
Property
Unit
Value
grammage
g/m 2
94
hill count
cm-1
17
nm/g
70
extended tensile index
machine direction
cross machine direction
nm/g
33
tensile strength
machine direction
kn/m
4.3
cross machine direction
kn/m
3.0
20 ˚c
0.0035
dissipation factor in air/oil*
elongation at break
90 ˚c
0.0040
machine direction
%
52
cross machine direction
%
4.2
ash content
%
0.3
conductivity of aqueous extract
ms/m
2.1
ph of aqueous extract
–
6.9
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
19
crepe paper type 60/120
Property
Unit
Value
grammage
g/m
122
hill count
cm-1
extended tensile index
tensile strength
20
machine direction
nm/g
51
cross machine direction
nm/g
33
machine direction
kn/m
4.1
cross machine direction
kn/m
4.3
20 ˚c
0.0035
90 ˚c
0.0040
%
98
dissipation factor in air/oil*
elongation at break
2
machine direction
%
4.1
ash content
cross machine direction
%
0.3
conductivity of aqueous extract
ms/m
2.3
ph of aqueous extract
–
7.0
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
crepe paper type 60/170
Property
Unit
Value
grammage
g/m
171
hill count
cm-1
extended tensile index
tensile strength
18
machine direction
nm/g
60
cross machine direction
nm/g
35
machine direction
kn/m
3.8
cross machine direction
kn/m
5.7
20 ˚c
0.0035
dissipation factor in air/oil*
elongation at break
2
90 ˚c
0.0040
machine direction
%
173
cross machine direction
%
4.9
ash content
%
0.3
conductivity of aqueous extract
ms/m
2.4
ph of aqueous extract
–
6.9
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
20
crepe paper type 67/100
Property
Unit
grammage
g/m
hill count
cm-1
extended tensile index
tensile strength
Value
104
12
machine direction
nm/g
69
cross machine direction
nm/g
33
machine direction
kn/m
4.7
cross machine direction
kn/m
3.3
20 ˚c
0.0035
90 ˚c
0.0040
%
52
dissipation factor in air/oil*
elongation at break
2
machine direction
cross machine direction
ash content
%
4.3
%
0.3
conductivity of aqueous extract
ms/m
2.0
ph of aqueous extract
–
6.8
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
crepe paper type 67/130
Property
Unit
grammage
g/m
hill count
cm-1
extended tensile index
tensile strength
134
16
nm/g
63
cross machine direction
nm/g
36
machine direction
kn/m
4.5
cross machine direction
kn/m
4.6
20 ˚c
0.0035
90 ˚c
0.0040
%
96
machine direction
cross machine direction
ash content
Value
machine direction
dissipation factor in air/oil*
elongation at break
2
%
4.7
%
0.3
conductivity of aqueous extract
ms/m
1.9
ph of aqueous extract
–
6.8
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
21
crepe paper type 80/120
Property
Unit
Value
grammage
g/m
122
hill count
cm-1
extended tensile index
tensile strength
15
machine direction
nm/g
67
cross machine direction
nm/g
33
machine direction
kn/m
5.3
cross machine direction
kn/m
4.0
20 ˚c
0.0035
90 ˚c
0.0040
%
54
dissipation factor in air/oil*
elongation at break
2
machine direction
%
5.0
ash content
cross machine direction
%
0.3
conductivity of aqueous extract
ms/m
2.0
ph of aqueous extract
–
6.9
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
crepe paper type 80/160
Property
Unit
Value
grammage
g/m
161
hill count
cm-1
extended tensile index
tensile strength
15
machine direction
nm/g
63
cross machine direction
nm/g
35
machine direction
kn/m
5.0
cross machine direction
kn/m
5.4
20 ˚c
0.0035
dissipation factor in air/oil*
elongation at break
2
90 ˚c
0.0040
machine direction
%
103
cross machine direction
%
5.0
ash content
%
0.3
conductivity of aqueous extract
ms/m
2.0
ph of aqueous extract
–
6.8
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
22
crepe paper type 100/150
Property
Unit
grammage
g/m
hill count
cm-1
extended tensile index
tensile strength
Value
152
15
machine direction
nm/g
57
cross machine direction
nm/g
33
machine direction
kn/m
5.3
cross machine direction
kn/m
6.0
20 ˚c
0.0035
dissipation factor in air/oil*
elongation at break
2
machine direction
cross machine direction
90 ˚c
0.0040
%
50
%
4.1
ash content
%
0.3
conductivity of aqueous extract
ms/m
2.0
ph of aqueous extract
–
6.8
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
crepe paper type 100/200
Property
Unit
grammage
g/m
hill count
cm-1
extended tensile index
tensile strength
ash content
Value
206
8
machine direction
nm/g
57
cross machine direction
nm/g
33
machine direction
kn/m
5.7
cross machine direction
kn/m
6.6
20 ˚c
0.0035
dissipation factor in air/oil*
elongation at break
2
90 ˚c
0.0040
machine direction
%
109
cross machine direction
%
4.4
%
0.3
conductivity of aqueous extract
ms/m
1.9
ph of aqueous extract
–
6.9
*oil in the paper pores contributes to the dissipation factor value. if the oil is new and properly processed, nearly the same values as far the measurements in air can be obtained.
23
aluminium crepe paper
high elongation paper for electrostatic
shielding
aluminium Crepe Paper provides
efficient shielding against electro­
static fields. The eddy current
formation in the aluminium caused
by magnetic fields is moderate. Typi­
cal applications include transformer
coils, cables, bushings, electronic
components, and other electrical
devices.
24
To manufacture this paper,
Weidmann laminates electrical
kraft paper on aluminium foil, using
a nonconductive adhesive that is
insoluble in water and hot oil. its
high elongation and flexibility allows
aluminium Crepe Paper to wrap
snugly and precisely around any
size or shape.
technical data
The technical data reflect typical
results of routine tests performed
in Weidmann laboratories accord­
ing to ieC Standards 60554­2 and
60243­1. These typical values do
not constitute specifications of
Weidmann products.
aluminium crepe paper
thickness
total uncreped
total creped
0.09 mm*
0.38 mm
master size
standard width
standard roll diameters
for slit tapes
standard roll diameters
for master roll
internal
external
internal
external
730 mm
730 mm
50 mm
135, 190, 300 mm
70 mm
550 mm
*aluminium layer thickness: 0.009 mm (9 µm)
Property
Unit
grammage
g/m
hill count
cm-1
15
nm/g
57
2
Value
136
extended tensile index
machine direction
cross machine direction
nm/g
29
tensile strength
machine direction
kn/m
4.9
cross machine direction
kn/m
3.8
machine direction
%
56
elongation at break
cross machine direction
moisture content
%
3.0
%
<6
conductivity of aqueous extract
ms/m
6.8
ph of aqueous extract
–
7.3
25
storage recommendation
Cellulose­based insulation exhibits
hygroscopic properties. Therefore, it
should be kept dry in the storeroom.
On receipt of a consignment of ma­
terial, the packing must be examined
to ascertain that it is undamaged and
the moisture proof wrapping is intact.
if the wrappers are satisfactory, it is
preferable to leave the material in its
original packing until near the time
for use.
if the packaging material shows
any sign of damage, it is advisable
to check that the contents are dry
and then repair the wrappers before
placing the insulation in the storage
area. insulation must never be stored
directly on a concrete floor but must
always be kept on wooden pallets
or shelves.
do not store any insulation exposed
to direct sunlight, near radiators or
open windows and doors or beneath
overhead heaters.
Before use it is also recommended
that crates and cases should be
unpacked and the material allowed
to adjust to the prevailing relative
humidity of the storeroom/workshop.
This does not mean that rolls and
sheets etc. can be left uncovered.
They must always be kept clean
and protected from airborne dust
and droplets of moisture that may
condense on, and fall from, overhead
structures.
Packing method of Crepe Paper with a roll width of 2.50 m
26
storage oF diamond dotted presspaper
at room temperature (20°C), diamond dotted Presspapers
may be stored for one year avoiding direct sunlight and
proximity to radiators. if stored at the limit of the shelf life
or at higher temperatures, it is recommended to test the
re­activity of the resin before use.
27
WEIDMANN ElEctrical tEchnology ag
neue Jonastrasse 60, 8640 rapperswil, Switzerland, www.weidmann-electrical.com
a Member of the WICOR group